INDEX. 



339 



Spirtfcr, n. up. 66 



__ ,»P» 76 



Spring Arbor, JackBon Co. , 98. 99. 115 



Springport, Jackson Co. , 112 



Springs and wells, 199 



Squaw Ft., Thunder Bay. 72 



Stalactites at Plaster Bluff, 94 



State Salt Well, Grand BapldB, 76, 90, 91 



statistics of 144 



St. Clair Co. , 73, 83, 199 



Stevens' Ridge Coal, 169 



Stevens, R. P., on fossils from Battlo 



Creek 87 



Stigmaria, 117, 120 



St. JoBephCo., 76 



St. Joseph's I. 60,63,65 



St. Louis Limestone in Mich. , Ill 



St. Martin's I., (Little,) 67 



St. Mary's Falls Ship Canal, 67 



St. Mary's R., 60,61 



Stockman, J. G. 81 



Stone I., Saginaw Bay 100 



vegetation of . , 328 



Stony Ft., L. Erie, 62,64,66,127 



Stratification of Mich. , as determined by 



Dr. Houghton, 7,12 



Strepttlasma cornicvlum, 62 



Stria on rocks in Monroe Co. , 127 



Strike of strata, what, and how produced, 43 



Strontianite, 66 



Strophodonta B . sp., 66 



Stnplwmena camerala, 62 



plici/vra, 62 



fliUxta, 62 



rugosa, 66 



ftemispftertca, 65 



n. sp., 62 



Subterranean passages in Monroe Co. ,. . . . 65 



SubulitesdongatuSy 62 



D. sp., 62 



Sugar I., 60,61 



Sulphur I. , in Thunder Bay, 71, 72 



Sulphur 1. , N. of Drummond's I. , 60, 52 



Sulphur Springs, 205 



Summit, Jackson Co., 98 



Sun-cracks in L. Superior Sandstone, 60 



Superficial materials, 127 



depth of, at various places, 163 



Surface fossils of Mich., 63 



Survey.Geological, organization of former, 7 



authorization of present, 17 



organization of present 21 



its comprehensiveness, SO 



when to be completed, 87 



plan of, for 1861, 38 



how aid may be rendered to 89 



Synoptical View of the geology of the 



Lower Peninsula, 138 



Syringopora 66, 100, 101, 102, 104 



T. 



Table of Geological Formations in Mich- 

 igan, *.•_••■ V"^ 2 '*^ 



showing thickness and depth of for 



malions, . . 



163 



of equivalent expressions for strength 



of brine J84 



of analyses of various brines, 186 



of altitudes of various points, 207 



Talcose slate in carboniferous sandstone,. 120 

 Talford Roberts, sulphur springs of,. .. ..206 



TawasBay, 93,96,96 



Tawas City,.-.- •• im-iSi 



Taylor's Salt Well, "Si •'It 



IHlina, «.™ 



Ikntacvlit*, °* 



Ibreorotute s«ore(rio/ormo, 108 



spf 108 



"Tertiary Clays," 12 



Tetradium ailuiamm, 62 



Thickness of formations, 163 



Thunder Bay I., 62,63,68,69 



Thunder Bay R. 69 



Upper Rapidsof 70 



Titus, (Mrs.,) quarry of 118 



Topography, 207 



Torch Light L., 72 



Trenton Group, 62 



IWtottto 69,88 



ZVocftclifes 86 



Tuscola Co., 82,97,114 



Tuscola, TuBcola Co. 120 



XT. 



Zlnio Uprosus, deBcription of, 240 



Union City, Branch Co. 76 



Upper Helderberg Group 60 



distribution of, 62 



thickness of, 63,154 



economical importance of, 68 



"Upper Limerock," 13,16 



VanBuren Co., 76 



Vienna, Monroe Co., 205 



Vieux Desert Lake, 47,49 



Volcanic Group of rocks, 48 



"W. 



Walker, Kent Co., 98 



Walker, Wm., sections obtained from,.. .117 



Wall, Chester, quarry of, 118 



Warsaw Limestone in Mich;, 112 



Washtenaw Co., 97 



Waverly Sandstone, 76 



Wayne Co. , 199 



Wells and Springs, 199 



Wexford Co. 97 



Whale, fossil remains of, 133 



Wheeler, Sherman 96 



Whetstones 74 



White, A. D. , Geological Assistant 23 



White Cedir, durability of 129 



notice of,. 297 



Whitcstone Pt.,L. Huron, 93,96 



Whittemore, C. H., information from, 96 



Wild Fowl Bay, 100,102 



Williams, B. O., information from 122 



Willow Creek, Huron Co., 74 



Winchell, N. II., Botanical Assistant in 



1860, 27, 246 



Windsor's Salt Well 90,93 



statistics of , 160,169 



Winnebago L., Wis. , 63 



Woodruff, B. F., communication from,... 29 

 Woodville Coal Mine. See "Coal." 

 Woodville Sandstone, 116, 122, 126, 126 



thicknesB of 168 



Wyoming, Kent Co., „ 91 



Y. 

 Yew, American, 297 



Z. 



Zoologists to the State 7 



Zoological collections, from Maumee R. , O. , 22 



from Saginaw R., 23 



in Oakland and contiguous counties,. 26 



in the western part of the State, 26 



Zoological investigations, utility of, 214 



provision for, in New York 216 



Zoological Report or Prof. Mile* 211 



Zwanno Quaddo, 72 



